Network Wiring Ground Fault Detection
NOTI•FIRE•NET™ PN 50257:E 7/5/01
19
Figure 15 Point-To-Point (EXAMPLE 2)
•
EXAMPLE 3:
Ground fault detection feed-through is effective for a maximum of two
serially connected (point-to-point) repeaters. Therefore, a maximum of five repeaters can be
connected in series when ground fault detection is required. Figure 16 shows how the ground
fault detection feed-through switches must be arranged in order to achieve this maximum
configuration.
Figure 16 Maximum Point-To-Point Series Repeater
Ground Fault Feed-Through Configuration (EXAMPLE 3)
Bus Configuration
In a bus configuration, as in point-to-point, only one node can provide ground fault detection along
the bus. The primary difference is that one node can provide ground fault detection for multiple
nodes along the bus (refer to EXAMPLE 1 and 2).
Note:
Refer to the
Network Adaptor
Module (NAM-232)
manual when
employing the NAM-
232W in place of the
MIB-W.
•
EXAMPLE 1:
The node second from the right in Figure 17 provides the ground fault
detection, and thus, must be an AFP-200/AFP-300/AFP-400, or AM2020/AFP1010/INA with
an MPS-24A Main Power Supply. SW1 (Port A) is set to the ON position to enable ground
fault detection feed-through from the MIB on this node. All other nodes have ground fault
detection on the MIB disabled. This includes the node on the far left of the figure, since
ground fault detection has been passed through the RPT-W from the node second from the
right.
Figure 17 Bus (EXAMPLE 1)
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